DC-bus operation Conditions for a trouble-free network of several drives Voltages 7 7.2 7.2.1 7.2 Conditions for a trouble-free network of several drives 7.2.1 Voltages Controllers can only be operated in a DC-bus connection, if the rated mains voltage/the rated DC-bus voltage is the same. All brake choppers in the DC-bus system must have the same thresholds. 7.2.2 Number of feeding points The 9400 servo drives series has been designed for drive systems with a central AC mains feeding point. For this you can use DC supply modules of different power categories.
Several AC mains feeding points are only permitted in drive systems with two single-axis controllers of the same power category with inverse operation in motor and generator mode. 7.2.3 Other conditions ƒ The entire DC power P DC must be provided by the feeding point (DC-supply module or ”Single Drive” controller). ƒ The controllers in the DC bus may only start operation when the DC bus has been completely loaded. I.e. controller enable may only be set after ”State bus OK” (see terminal X2). ƒ Up to a total current of 100 A, devices up to 24 1 3A (device sizes 1 ... 3) can be operated via the integrated DC busbar. Maximum busbar overload for 60 s:
150 % * I r , followed by a relief phase of 120 s: 75 % * I r . ƒ The DC bus must at no time be overloaded through the required maximum total power. For this, a time/performance diagram has to be created and considered (see Basic dimensioning). ƒ The cable protection measures described for the DC-bus operation must be observed. 7.2-1 EDS94SPP101 EN 3.1-04/2007